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test and research     
相关语句
  试验研究
     Test and Research on the Heat Treatment Technology of Stainless Steel 1Cr17Ni2
     1Cr17Ni2不锈钢热处理工艺试验研究
短句来源
     Test and Research on the Conbined Precision Drill 2BD-4Type
     2BD-4型组合式精密播种机试验研究
短句来源
     Test and Research on Parameters Optimization of SW-220K Bogies
     SW—220K型转向架参数优化试验研究
短句来源
     Test and research on HG-410/100-6 type bituminite boiler under condition of adding brown coal
     HG-410/100-6型烟煤锅炉掺烧褐煤的试验研究
短句来源
     Test and Research on Increasing the Service Life the W18Cr4V Steel Die for the Use of the Cold Extrusion Steel Gears
     提高W18Cr4V钢齿轮冷挤压模使用寿命的试验研究
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  试验与研究
     Test and Research on the Hardening of Neck of Cold Roll
     冷轧工作辊辊颈淬火试验与研究
短句来源
     Marine Questor Ⅳ mass spectrometer test and research
     QuestorⅣ船用质谱仪的试验与研究
短句来源
     Industrial test and research on hot rolled stainless steel process lubricating
     热轧不锈钢工艺润滑工业性试验与研究
短句来源
     Test & Research Performance Test and Research on Rubber Stack Positioners of Trucks Type 209HS
     209HS型转向架橡胶堆定位器的性能试验与研究
短句来源
     Performance and effect to cotton growth and yield of 3MD-12 cotton top-cutting machine are expatiated in this paper by test and research.
     就3MD-12型棉花打顶机田间作业性能以及机械打顶对棉花生长发育和产量的影响进行了试验与研究
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更多       
  试验和研究
     The test-bed for rotary sealing ring is equipment of certain factory that can be used to test quality character of rotary sealing ring. It is mainly used for rotary sealing ring of test and research.
     回转式密封环试验台是一生产企业的用于做回转式密封环性能试验的设备,它主要用于各种回转式密封环密封性能的试验和研究工作。
短句来源
     From increasing the strength and density of concrete to start, the test and research were carried out for the sample of cement mortar by using PIC method in this paper.
     从提高混凝土强度和密实性出发,采用“PIC”法对水泥砂浆试块进行试验和研究
短句来源
     In order to make the engineering construction quality better, speed quicker and cost more economic, on the base of full test and research, some new technologies and new materials have boldly been introduced and applied to solve some engineering technology difficult problems during construction period of Hongjiadu Hydropower Station.
     洪家渡水电站建设过程中,在充分试验和研究的基础上,对引进和消化新技术、新材料做了大胆的探索和尝试,用以解决了多项工程技术难题,使工程建设质量更好、进度更快、投资更省。
短句来源
  测试与研究
     A test and research on the gas cleaning system of 2500 m3 blast furnace at Maanshan Iron & Steel Co.,Ltd.
     马钢2500m~3高炉煤气清洗系统的测试与研究
短句来源
     The Test and Research of the 8XC196KB Single Chip Micro Computers High-speed Output Control Performance
     8XC196KB单片机HSO控制性能的测试与研究
短句来源
     Dynamic Performances Test and Research on SHST Servohydraulic Control System for E1 Rolling Mill of Hot Strip Mill
     热轧E1轧机短行程液压伺服系统动态性能测试与研究
短句来源
     The Test and Research of ADC0809 Analog-to-Digital Converter Master
     ADC0809模数转换器的测试与研究
短句来源
     THE EXPERIMENT TEST AND RESEARCH OF THE FLUORESCENT SPECTRUM OF HE-NE DISCHARGE TUBE GAINING
     He—Ne放电管荧光光谱增益的实验测试与研究
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    Plasticizing agent is an organic surface-active admixture for cement mortar and concrete. It may be introduced also as an "addition" to the clinker during the grinding process in the manufacture of plasticizing Portland cement. In the USSR, the plasticizing agent under the name of "has been extensively and successfully used in construction works.The plasticizing agent is prepared by chemical treatment of the waste from the alcoholic fermentation of sulfite liquor in pulp manufacture. It contains calcium lignin...

    Plasticizing agent is an organic surface-active admixture for cement mortar and concrete. It may be introduced also as an "addition" to the clinker during the grinding process in the manufacture of plasticizing Portland cement. In the USSR, the plasticizing agent under the name of "has been extensively and successfully used in construction works.The plasticizing agent is prepared by chemical treatment of the waste from the alcoholic fermentation of sulfite liquor in pulp manufacture. It contains calcium lignin sulphonate as an effective component and thus possesses hydrophilic property. Due to the adsorption of the agent, a colloidal layer is formed on the surface of the cement particle; hence the effective dispersion and the increase of lubricity between the particles.Following the Soviet experience of CCB, the Materials-Testing and Research Laboratory of Shanghai Civil Engineering Bureau successfully experimented with the preparation of thermal polymer of the plasticizing agent, and a series of tests on the characteristics of the agent were made. This paper attempts to describe the method of preparation and the main properties of the agent.The addition of the agent in an amount of 0.1—0.2% of cement (dry weight) markedly improves the workability and the texture of the mortar and concrete mixtures. It reduces the water requirement and the cement content. It improves the impermeability and durability of the hardened mortar and concrete.The agent has a retarding effect on the setting of cement. It lowers the early strength of mortar and concrete, while the strength of later age is higher than those without admixtures. The use of CaCl_2 accelerator in 0.5—1% of cement by weight speeds up the rate of development of the early strength.The proper dosage of the agent depends upon the properties of cement. Therefore, certain tests should be made with the specified cement and aggregates on the job before the adoption of the agent.

    本文介紹亞硫酸鹽酒精液滓塑化劑實驗室中的試製以及對於水泥膠砂及混凝土技術性能方面的作用。首先說明一些塑化劑的理論及亞硫酸鹽酒精液滓的技術規格,再簡要的介紹上海市政工程局材料試驗研究所試驗研究的經過和結果;最后综合蘇聯對於塑化劑和塑化水泥使用的先進經驗。塑化剂是一種有機的表面活動性物質,利用造紙工業发液進行酒精發酵所得的液滓。加入微量的塑化劑——約為水泥重量的0.1—0.25%,可以顯著的改善膠砂和混凝土的性質。在增加流動性、改善和易性和提高耐久性方面,有十分的效用,尤其是對節約水泥用量有极大的意義。祖國的建设事業正迫切需要這類新型的建築材料,因此提供一些试驗研究結果,以供国家主管機關和科技工作同志們深入研究和推廣使用時的參考。

    Cracks in the massive concrete of hydraulic structures are most harmful because of the mechanical and physical action of the percolating water. Since it is rather difficult to estimate whether the cracks are stable or not by convensional design methods,most hydrostructures are often designed under conservative consideration. The theory of fracture mechanics are now widely used in aeronautical and mechanical engineering with good results, but it is seldom used in hydraulic structures. In this paper, some possible...

    Cracks in the massive concrete of hydraulic structures are most harmful because of the mechanical and physical action of the percolating water. Since it is rather difficult to estimate whether the cracks are stable or not by convensional design methods,most hydrostructures are often designed under conservative consideration. The theory of fracture mechanics are now widely used in aeronautical and mechanical engineering with good results, but it is seldom used in hydraulic structures. In this paper, some possible applications of fracture mechanics in designing massive concrete works are described and shown with numerical examples,including. (1) the criteria for the stability of cracks or joints in massive concrete by the stress intensity factor, (2) the amount required and the effect of the reinforcement for closing the cracks,(3) the determination of crack depth. However,for the further development of this theory in practical design work,more tests and research works are still needed.

    水工建筑物大体积混凝土中产生延伸较长的裂缝后,由于缝中渗透水流的物理和力学作用,将对建筑物产生有害的影响.因此许多水工建筑物都有防裂要求.但是,采用普通的设计理论既不易保证不开裂,更难判断一旦形成微细裂缝后裂缝的稳定性,因而常不得不采用较为保守的准则和方法.断裂力学的发展对研究解决金属材料裂缝的有关问题已取得很好的效果,从而在金属结构设计中已被广泛采用,但在水工结构中的应用尚属少见.本文讨论了断裂力学在水工设计中的几种应用可能,例如:混凝土中贯穿缝的稳定性;并缝钢筋的作用及计算方法;裂缝延伸深度的确定;以及混凝土坝上游面的开裂问题等,并给出了数例.这些建议都是从理论推导得出,是否适用有待实践考验.总之,断裂力学可能是水工设计中一种有用的工具,但要在实践中广泛采用还需要进行大量的研究试验工作.

    The numeral analogy, test and research are carried on for the dynamic characteristic of pressure limited variable vane pump by power bond graph and conditon space analysis method. The effect of various main parameters on the dynamic characteristic of pump is analysed to provide the basis for reasonable design of variable vane pump.

    本文用功率键合图和状态空间分析法,对限压式变量叶片泵的动态特性进行了数字模拟和试验研究,分析了各主要参数对泵的动态性能的影响,为变量叶片泵的合理设计提供了依据。

     
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